body {
    background-image: url(~/assets/img/wallhaven-wqery6-dark.webp);
    background-size: cover;
    background-repeat: no-repeat;
    background-attachment: fixed;
}  
/* 全局引入，修改 element ui z-index 过低问题 */
.el-message {
    z-index: 9999 !important;  
    /* position: fixed !important; */
}